Robert Hollander's Barlow Lectures: on debate of authenticity of the epistle to Cangrande. Published 1993 by the University of Michigan Press, Ann Arbor.
Rennaissance Dante in Print: history of the Comedy's manuscript tradition, includes pages by the famous Renaissance printer Aldus Manutius collection
Cupola: A Voyage Within: images of the Final Judgment on the cupola of Santa Maria del Fiore in Florence. Detail of Inferno by Zuccari. Impressionist interactive painting program